A spike in PC demand has created a new shortage of Intel chipsets, potentially reviving an issue blamed for causing the company to lose market share to rival AMD last year. Demand for new PCs spiked after the two microprocessor makers slashed prices for desktop chips in late July, but the sharp rise in purchases has caused component makers to scramble to keep up, said Sunny Han, director of marketing at Asustek, the world's largest motherboard maker.